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<h2><a name="SECTION009350000000000000000"></a>
<a name="mailbox-examples"></a>
<br>
7.3.5 Examples
</h2>

<p>
A simple example of printing the subjects of all messages in a mailbox that
seem interesting:

<p>
<div class="verbatim"><pre>
import mailbox
for message in mailbox.mbox('~/mbox'):
    subject = message['subject']       # Could possibly be None.
    if subject and 'python' in subject.lower():
        print subject
</pre></div>

<p>
To copy all mail from a Babyl mailbox to an MH mailbox, converting all
of the format-specific information that can be converted:

<p>
<div class="verbatim"><pre>
import mailbox
destination = mailbox.MH('~/Mail')
destination.lock()
for message in mailbox.Babyl('~/RMAIL'):
    destination.add(MHMessage(message))
destination.flush()
destination.unlock()
</pre></div>

<p>
This example sorts mail from several mailing lists into different
mailboxes, being careful to avoid mail corruption due to concurrent
modification by other programs, mail loss due to interruption of the
program, or premature termination due to malformed messages in the
mailbox:

<p>
<div class="verbatim"><pre>
import mailbox
import email.Errors

list_names = ('python-list', 'python-dev', 'python-bugs')

boxes = dict((name, mailbox.mbox('~/email/%s' % name)) for name in list_names)
inbox = mailbox.Maildir('~/Maildir', factory=None)

for key in inbox.iterkeys():
    try:
        message = inbox[key]
    except email.Errors.MessageParseError:
        continue                # The message is malformed. Just leave it.

    for name in list_names:
        list_id = message['list-id']
        if list_id and name in list_id:
            # Get mailbox to use
            box = boxes[name]

            # Write copy to disk before removing original.
            # If there's a crash, you might duplicate a message, but
            # that's better than losing a message completely.
            box.lock()
            box.add(message)
            box.flush()         
            box.unlock()

            # Remove original message
            inbox.lock()
            inbox.discard(key)
            inbox.flush()
            inbox.unlock()
            break               # Found destination, so stop looking.

for box in boxes.itervalues():
    box.close()
</pre></div>

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<span class="release-info">Release 2.5.1, documentation updated on 18th April, 2007.</span>
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